检索结果-南通市图书馆

体育科学 1993年第1期13卷 18-27,93-94页

作者：王清李汀魏星国家体委科研所北京100061

文章首先简要地介绍和讨论了与肌肉力量测量方法有密切关系和应该明确的几个基本问题,即关于肌肉收缩的五种基本形式,关于国际上肌肉力量分类的研究结果,关于绝对力量、最大力量、快速力量、起动力量、爆发力量、反应力量、力量耐力等... 详细信息

文章首先简要地介绍和讨论了与肌肉力量测量方法有密切关系和应该明确的几个基本问题,即关于肌肉收缩的五种基本形式,关于国际上肌肉力量分类的研究结果,关于绝对力量、最大力量、快速力量、起动力量、爆发力量、反应力量、力量耐力等定义。然后,介绍了用于肌肉力量测量的实验室和运动场测量方法。其中,就基本测量指标、基本测量仪器、基本测量要求和注意事项、各种仪器和测量方法的优点及主要不足等进行了探讨。最后,提出了有关肌肉力量训练水平的检查与评定的基本设想。

关键词：肌肉力量最大力量快速力量反应力量力量耐力起动力量爆发力量

On (2~m + 1)-variable symmetric Boolean functions with submaximum algebraic immunity 2^(m-1)

在线全文

学校读者我要写书评

暂无评论

Science china Mathematics 2009年第1期52卷 17-28页

作者： LIAO QunYing1, LIU Feng2 & FENG KeQin2 1 College of Mathematics and Software Sciences, Sichuan Normal University, Chengdu 610066, china 2 Department of Mathematical Sciences, Tsinghua University, beijing 100084, china College of Mathematics and Software Sciences Sichuan Normal University Chengdu 610066 China Department of Mathematical Sciences Tsinghua University Beijing 100084 China

All (2m +1)-variable symmetric Boolean functions with submaximal algebraic immunity 2m-1 are described and constructed. The total number of such Boolean functions is 3. ·22m-3.+3.-2 · 24 - 2 for m≥2.

关键词： symmetric Boolean function algebraic immunity cryptography

Analysis of Integrated Water vapor and Cloud Liquid Water Measured by Multi-Frequency Microwave Radiometer

在线全文

学校读者我要写书评

暂无评论

Analysis of Integrated Water vapor and Cloud Liquid Water Me...

中国县域乳腺癌防治管理路径与质量控制指南(2023.)

2010 Second IITA International Conference on Geoscience and Remote Sensing (IITA-GRS 2010)

作者： HE Jieying national microwave remote sensing laboratory Center for space science and applied research CAS beijing china ZHANG Shengwei ZHANG Yu SUN Fenglin national microwave remote sensing laboratory Center for space science and applied research CAS beijing china

This paper analysizes and retrieves atmospheric integrated water vapor content and liquid water content which are two critical parameters in the process of artificial rainfall and other weather forecasting and weather modification. According to the atmospheric sounding principle and experiment datasets this paper used linear regression method and nonlinear regression method to retrieve these parameters and then chose the better and suitable method-nonlinear regression method. The retrievals using both methods show that the paper successfully obtains the atmospheric integrated water vapor and cloud liquid water content with acceptable root mean square error. And using nonlinear regression method can obtain the integrated water vapor content and liquid water content which are considered as internal levels.

关键词： integrated water vapor liquid water linear regression nonlinear regression root mean square error

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

中华肿瘤杂志 2024年第1期46卷 1-18页

作者：国家肿瘤质控中心乳腺癌专家委员会健康中国研究中心癌症防治专家委员会马飞徐兵河兰波路平刘梦友不详国家癌症中心、国家肿瘤临床医学研究中心、中国医学科学院北京协和医学院肿瘤医院内科北京100021 国家癌症中心、国家肿瘤临床医学研究中心、中国医学科学院北京协和医学院肿瘤医院药物临床试验研究中心北京100021 新乡医学院第一附属医院肿瘤内科利辛县人民医院甲乳外科

乳腺癌是威胁中国女性健康的第一大恶性肿瘤。2016年中国女性新发乳腺癌3..60万例, 其中中国县域地区(包含农村地区)新发乳腺癌约10.04万例, 约占同年中国总新发乳腺癌的3.%。县域(县级或县级市)医院是多数县域乳腺癌患者的首诊单位, ... 详细信息

乳腺癌是威胁中国女性健康的第一大恶性肿瘤。2016年中国女性新发乳腺癌3..60万例, 其中中国县域地区(包含农村地区)新发乳腺癌约10.04万例, 约占同年中国总新发乳腺癌的3.%。县域(县级或县级市)医院是多数县域乳腺癌患者的首诊单位, 在乳腺癌的预防、筛查、维持治疗、康复随访和转诊等方面发挥重要作用。县域医院由于经济和地理等因素的限制, 在医疗设备、人才、药物可及性等方面都相对不足, 亟需适合县域实际情况的乳腺癌防治管理指南。因此, 在分级诊疗的政策背景下, 国家肿瘤质控中心乳腺癌专家委员会和健康中国研究中心癌症防治专家委员会起草并制定了《中国县域乳腺癌防治管理路径与质量控制指南(2023.)》, 旨在进一步促进优质医疗资源扩容下沉、区域均衡布局, 提高整体乳腺癌的防控效果, 改善县域乳腺癌患者的预后和生活质量。指南采用路径形式, 更加简明清晰且实操性强, 以供广大县域临床医师参考。

关键词：乳腺肿瘤防治管理质量控制县域指南

Controlling Pore Size and its Distribution of γ-Al_2O_3.Nanofiltration Membranes

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2003年第9期14卷 969-972页

作者： Rong Chun XIONG, Xiao Dong LEI, Gang WEI beijing University of Chemical technology, beijing 100029 beijing Univ. of Chemical Technology Beijing 100029 China

The preparation process of γ-A12O3.nanofiltration membranes were studied by N2 absorption and desorption test and retention rate vs thickness gradient curve method. It was found that template and thermal treatment were key factors for controlling pore size and its distribution. Under the optimized experimental conditions, the BJH (Barret-Joyner-Halenda) desorption average pore diameter, BJH desorption cumulative volume of pores and BET (Brunauer-Emmett-Teller) surface area of obtained membranes were about 3.9 nm, 0.3. cm3.g and 245 m2/g respectively, the pore size distribution was very narrow. Pore size decreased with the increasing of thickness and no evident change after the dense top layer was formed. The optimum thickness can be controlled by retention rate vs thickness gradient curve method.

关键词： Nanofiltration γ-Al2O3.membrane membrane pore size N2 absorption-desorption test.

The Cretaceous tectonic event in the Qiangtang Basin and its implications for hydrocarbon accumulation

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2010年第4期7卷 466-471页

作者： Li Yalin Wang Chengshan Li Yongtie Ma Chao Wang Licheng Peng Shaonan State Key Laboratory of Geological Processes and Mineral Resources Research Center for Tibetan Plateau Geology China University of Geosciences Beijing 100083 China Petroleum Exploration and Development Research Institute PetroChina Beijing 100083 China

The tectonic event during Cretaceous and its relationship with hydrocarbon accumulation in the Qiangtang Basin is discussed based on zircon U-Pb dating and the study of deformation, thermochronology and hydrocarbon formation. LA-ICPMS zircon U-Pb dating indicates that the tectonic event took place during the Early-Late Cretaceous （125-75Ma）. The event not only established the framework and the styles of structural traps in the basin, but also led to the cessation of the first hydrocarbon formation and the destruction of previous oil pools. The light crude oil in the basin was formed during the second hydrocarbon formation stage in the Cenozoic, and ancient structural traps formed during the Cretaceous event are promising targets for oil and gas exploration.

关键词： Qinghai-Tibet plateau Qiangtang Basin tectonic event Cretaceous hydrocarbon accumulation

The associations between the environmental exposure to polychlorinated biphenyls (PCBs) and breast cancer risk and progression

在线全文

学校读者我要写书评

暂无评论

Science china Chemistry 2010年第5期53卷 974-979页

作者： LIU SiJin ,ZHANG ShuPing,QU Chen,LIU Wei & DU YuGuo State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,beijing 100085,china 1. State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China

Polychlorinated biphenyls(PCBs) are chlorinated biphenyl compounds with wide applications in the *** spite of a ban on their production in the late 1970s,PCBs,as a group of POPs,are still persistent and widely spread in the environment,posing potential threats to human *** role of PCBs as etiologic agents for breast cancer has been intensively explored in a variety of in vivo,animal and epidemiologic *** investigations indicated higher levels of PCBs in mammary tissues or sera corresponded to the occurrence of breast cancer,but later studies showed no positive association between PCB exposure and breast cancer *** recent data suggested that the CYP1A1 m2 polymorphisms might add increased risk to the etiology of breast cancer in women with environmental exposure to *** are implicated in advancing breast cancer progression,and our unpublished data reveals that PCBs activate the ROCK signaling to enhance breast cancer ***,the correlation between PCB exposure and breast cancer risk warrants further careful investigations.

关键词： Polychlorinated biphenyls (PCBs) environmental exposure CYP1A1 polymorphisms breast cancer risk tumor progression

ELECTROCHEMICAL COPOLYMERIZATION OF ANILINE AND AZURE B

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2001年第5期19卷 483-492页

作者： Dan Shan Shao-lin Mu Bing-wei Mao Yong-fang Li Department of Chemistry School of Science, Yangzhou University Yangzhou 225002, china State Key Laboratory of Physical Chemistry of Solid Surface, Xiamen University Xiamen 3.1005 china Center for Molecular Science. Institute of Chemistry Chinese Academy of Sciences, beijing 100080 china Yangzhou Univ Sch Sci Dept Chem Yangzhou 225002 Peoples R China Xiamen Univ State Key Lab Phys Chem Solid Surface Xiamen 361005 Peoples R China Chinese Acad Sci Inst Chem Ctr Mol Sci Beijing 100080 Peoples R China

The electrochemical copolymerization of aniline and N,N,N'-trimethylthionin (azure B) in aqueous solutions has been carried out using the potential sweep method. The optimum conditions for the coelectrodeposition are that the pH value and the temperature of the electrolytic solution are controlled at 5.57 and 3. degreesC, respectively, and the scan potential range is set between -0.25 and 1.10 V (versus SCE). The copolymerization rate of aniline and azure B is about 3.times larger than that of aniline in the absence of azure B. The copolymerization of aniline and azure B was verified from the results of visible spectra during electrolysis, FTIR spectra and the atomic force microscopy (AFM) images of the polymers. The in situ visible spectrum for the electrolysis of the solution containing aniline and azure B is different from that of the respective aniline and azure B. The FTIR spectrum of the copolymer is not a superposition of that of polyaniline and poly(azure B). The AFM image of the copolymer is different from those of polyaniline and poly(azure B) and is not a mixture of individual polymers. The conductivity of the copolymer synthesized at pH 5.57 is four orders of magnitude higher than that of polyaniline synthesized under the same conditions, but in the absence of azure B. The electrochemical properties of the copolymer are mainly attributed to polyaniline, but the copolymer has a better electrochemical reversibility and a much faster charge transfer than those of polyaniline.

关键词： aniline azure B electrochemical copolymerization characterization of copolymer electrochemical property

A computational investigation on random packings of sphere-spherocylinder mixtures

在线全文

学校读者我要写书评

暂无评论

Science china(Physics,Mechanics & Astronomy) 2010年第12期53卷 2284-2292页

作者： LU Peng, LI ShuiXiang , ZHAO Jian & MENG LingYi State Key Laboratory for Turbulence and Complex Systems, Department of Mechanics & Aerospace Engineering, College of Engineering, Peking University, beijing 100871, china 1. State Key Laboratory for Turbulence and Complex Systems Department of Mechanics & Aerospace Engineering College of Engineering Peking University Beijing 100871 China

Random packings of binary mixtures of spheres and spherocylinders with the same volume and the same diameter were simulated by a sphere assembly model and relaxation algorithm. Simulation results show that, independently of the component volume fraction, the mixture packing density increases and then decreases with the growth of the aspect ratio of spherocylinders, and the packing density reaches its maximum at the aspect ratio of 0.3.. With the same volume particles, results show that the dependence of the mixture packing density on the volume fraction of spherocylinders is approximately linear. With the same diameter particles, the relationship between the mixture packing density and component volume fraction is also roughly linear for short spherocylinders, but when the aspect ratio of spherocylinders is greater than 1.6, the curves turn convex which means the packing of the mixture can be denser than either the sphere or spherocylinder packing alone. To validate the sphere assembly model and relaxation algorithm, binary mixtures of spheres and random packings of spherocylinders were also simulated. Simulation results show the packing densities of sphere mixtures agree with previous prediction models and the results of spherocylinders correspond with the simulation results in literature.

关键词： packing binary mixture sphere spherocylinder packing density aspect ratio